40013917 has 2 divisors, whose sum is σ = 40013918. Its totient is φ = 40013916.

The previous prime is 40013863. The next prime is 40013947. The reversal of 40013917 is 71931004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27154521 + 12859396 = 5211^2 + 3586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40013917 is a prime.

It is a super-2 number, since 2×40013917² = 3202227107365778, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40013891 and 40013900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40013947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20006958 + 20006959.

It is an arithmetic number, because the mean of its divisors is an integer number (20006959).

Almost surely, 2^40013917 is an apocalyptic number.

It is an amenable number.

40013917 is a deficient number, since it is larger than the sum of its proper divisors (1).

40013917 is an equidigital number, since it uses as much as digits as its factorization.

40013917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 40013917 is about 6325.6554601085. The cubic root of 40013917 is about 342.0348476284.

The spelling of 40013917 in words is "forty million, thirteen thousand, nine hundred seventeen".